Optimization Design And Experimental Research Of BRDF Measurement System

Bidirectional reflectance function(BRDF)can effectively to all kinds of material surface scattering and radiation characteristics of the feature description,generally reflect despite all the optical feature of geometric characteristics,so the study of BRDF is of important value.At present,the light scattering technology has been widely used in computer image processing,satellite remote sensing,scattering calculation and other fields.Therefore,this paper is of great significance for the research on the scattering measurement system based on BRDF.Firstly,the basic principle and related technology of BRDF measurement system are introduced in detail.The overall structure of BRDF measurement system is designed,and the design of measurement system mechanical structure,motion control system and signal acquisition system is elaborated in detail.The system uses a high-sensitivity photomultiplier tube(PMT)to detect weak signal lock-in amplifiers and enables measurement of weakly scattered light signals under strong noise background.The virtual instrument software Lab VIEW is used to design the software of the measurement system.The system measurement software realizes the data transmission between the computer and the lock-in amplifier;the control of the mechanical motion system;the real-time collection,processing,display,data storage and other functions of the scattered light.This enables the measurement system to perform effective automated measurements.In this paper,the BRDF measurement system is optimized and an experimental platform is set up.It is verified through experiments that the measurement system can meet the requirements of BRDF measurement.The scattering measurement experiment was performed using standard resolution plates,linear scratches,and pits as examples.From experimental data analysis,it can be known that the forward scattering is greater than the backward scattering.The spatial azimuth measurement range of the system is 0°-360°,the angular resolution is 0.1°,and the system dynamic range can reach 1011 orders of magnitude.The performance of the scattering measurement system was studied.The study proved that the system has good repeatability and stability.